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Re: [PATCH] Split of raid scan code

From: Bean
Subject: Re: [PATCH] Split of raid scan code
Date: Sun, 17 Aug 2008 22:19:52 +0800

On Sat, Aug 16, 2008 at 11:20 PM, Bean <address@hidden> wrote:
> On Sat, Aug 16, 2008 at 8:16 PM, Robert Millan <address@hidden> wrote:
>> On Sat, Aug 16, 2008 at 05:07:00PM +0800, Bean wrote:
>>> Hi,
>>> This new patch seperates raid5 and raid6 recover code from raid.c, and
>>> place them in module raid5rec.mod and raid6rec.mod. The recover code
>>> is only needed when some of the disk are missing or corrupted, which
>>> is not common. But raid.c is installed to mbr, so size is important.
>>> If there is enough room in mbr for the extra module, they can use
>>> --modules option in grub-install to add these modules.
>> I find this scary in the sense that users need to know about these modules
>> to get the benefit of recovery, and even then, they also need to know they
>> are affected by this problem when they install GRUB (since otherwise they
>> won't be able to bootstrap).
>> Is it possible to detect whether recover code will be needed when 
>> grub-install
>> is run, and then either add the extra modules or abort with an error?
> Hi,
> grub-probe don't use the recover module, so if it have problem at
> install time, user would know about it (error message would be
> "raid5rec not loaded"). Although, if problem occur afterwards, then
> it's unfortunate. It would be possible to detect them and add it to
> grub-probe, but the question is, it's not possible to calculate the
> size of core.img in grub-probe. if we add it statically, it could
> cause grub-install to fail later.


This patch include the following updates:

* add crc command to grub-fstest, also allow to compare device.
* support multipath
* support raid10, all layouts (near, far, offset)
* fix raid6 code when the layout is not left symmetric.


Attachment: raid_10.diff
Description: Text Data

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